Service manual Mastercool 30
Version 1.0
1.11.2011
13
Kemppi Oy
4.3.2.2. Over pressure alarm
When water circulation is blocked or resistance is too high, control electronics activate alarm
•
If pressure is over approx. 5 bars led H2 illuminates
•
This can be simulated by bending output water hose just after the snap connector
•
If over pressure lasts several seconds cooler gives error message (X3-1 goes to 0)
4.3.2.3. Normal operational pressure
Working pressure for this cooler is depending on the length of the cables and environment temperature.
Normally pressure is between 1,5 and 5 bars.
•
E.g. while using 16 meter long torch and/or working in temperatures under 0 pressure
can be up to 4 bars.
•
If normal working pressure is near 1 bar, there can be problem in pump membrane
and/or pressure valves. See next pages to maintain the pump.
•
Water cooled gun adds approx. 0,5 bars and this should be noticed when making
simulated pressure measurements. If using water hose loop in the end of the feeder
connection instead of a gun, working pressure will be lower than in real welding
situation.
4.3.2.4. Water flow test
•
Get a container with a scale for the water volume
•
Run water from cooler to the container and use stop watch to have exact time = t
•
See the result in the container scale = V1
•
Use formula below to calculate water flow per minute
Example 1:
Acceptable water flow per minute is more than 5dl/min. If water flow is less, this can be a mark of
problems in the pump.
t
V
V
total
60
1
⋅
=
dl
dl
s
s
dl
t
V
V
s
t
dl
V
total
8
2
4
30
60
4
60
30
4
1
1
=
⋅
=
⋅
=
⋅
=
=
=
